Expandable sealing mechanism



FIG. 1 is a perspective view of an expandable sealing mechanism;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a side elevation view thereof, it being understood that left and right sides views of the expandable sealing mechanism are identical;

FIG. 6 is a bottom perspective, exploded view thereof; and,

FIG. 7 is a side elevation, cross-sectional view taken along line 7-7 as shown in of FIG. 5.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an expandable sealing mechanism, as shown and described. 